The utility model relates to an inside spring dismouting assembly of valve body, which comprises the following components: a valve body, be provided with reset spring in the valve body, the reset spring front end is provided with the piston, and the piston middle part is provided with the connecting hole, and the piston rod front end inserts the connecting hole, and the piston rod is connected with the piston through lock nut, the lower part of terminal surface is provided with the rectangle clamp plate under the valve body, the rectangle clamp plate is connected with the valve body through locking screw and lock nut, rectangle clamp plate middle part is provided with the support column along central line bilateral symmetry, the support column outside is provided with the locating hole, still including the double -end disassembly wrench who is used for dismantling simultaneously lock nut. The utility model discloses inside spring dismouting assembly of valve body, simple structure, convenient operation, safe and reliable dismantles the in -process at equipment, prevents that the spring that is in compression state from restoring to the throne suddenly, prevents to guarantee operation workman's life safety because compression spring restores to the throne suddenly and leads to the fact personnel to injure to damage with equipment, improves work efficiency.